Citations (3)

DOI: https://doi.org/10.31857/S0869-56524875496-498

Funding agency	Grant number
Russian Foundation for Basic Research	19–01-00223
Ministry of Education and Science of the Russian Federation	5-100
This study was supported in part by the Russian Foundation for Basic Research, project no. 19-01-00223. The work of the second author was performed in part within the RUDN University Program 5-100.

Received: 07.05.2019

English version:
Doklady Mathematics, 2019, Volume 100, Issue 1, Pages 374–376
DOI: https://doi.org/10.1134/S1064562419040161

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